@manup you were correct, this error is indication that there is a lights json and not an authentication error and this case or the error I suspect that light 4 is corrupt.
As per the attached screenshot, the error I received was light 63 and deleting the light should allow Hue Essential to authenticate and process the json. However, they may need to look at the error handling in their app.
"63": {
"capabilities": {
"alerts": [
"none",
"select",
"lselect",
"blink",
"breathe",
"okay",
"channelchange",
"finish",
"stop"
],
"bri": {
"min_dim_level": 0
},
"color": {
"ct": {
"computes_xy": true,
"max": 65279,
"min": 0
},
"effects": [
"none"
],
"gamut_type": null,
"modes": [
"effect"
],
"xy": {
"blue": [
0,
0
],
"green": [
0,
0
],
"red": [
0,
0
]
}
},
"otau": {
"file_version": null,
"image_type": null,
"manufacturer_code": null
},
"sleeper": false
},
"colorcapabilities": 0,
"config": {
"bri": {
"startup": "previous"
},
"color": {
"ct": {
"startup": 336
},
"xy": {
"startup": [
0,
0
]
}
},
"groups": [
"0",
"13"
],
"on": {
"startup": "previous"
}
},
"ctmax": 65279,
"ctmin": 0,
"ddf_hash": null,
"ddf_policy": "latest_prefer_stable",
"etag": "33f80538bceeab8465edb44b086e19ef",
"hascolor": true,
"lastannounced": null,
"lastseen": "2025-04-27T11:47Z",
"manufacturername": "Philips",
"modelid": "LCT024",
"name": "Extended color light 63",
"nwkaddress": 54254,
"productid": null,
"state": {
"alert": "none",
"bri": null,
"colormode": "hs",
"ct": null,
"effect": "none",
"hue": null,
"on": null,
"reachable": false,
"sat": null,
"xy": [
0,
0
]
},
"swconfigid": null,
"swversion": null,
"type": "Extended color light",
"uniqueid": "00:17:88:01:04:f9:5d:89-0b"
}